Hillary Clinton

Asked during her final interview as secretary of state whether she could say with a straight face that she had no plans to run for president, Clinton told ABC, "Sitting here, right now, that is certainly what I believe."

Joe Biden

In a July 2013 interview, Vice President Joe Biden told GQ: “I can die a happy man never having been president of the United States of America. But it doesn’t mean I won’t run."

Chris Christie

In a Feb. 5 appearance on the "Late Show With David Letterman," Christie said: "I think everybody understands that if you see something you think you can do and you can do it well, then people give you an opportunity -- a fair opportunity to do it. But I'm nowhere near making that decision yet, at all. I mean, I think anybody who tries to plan in politics that far in advance is crazy."

Rand Paul

Asked on "Fox News Sunday" on Feb. 17 how serious he was about making a real run for the presidency, Sen. Rand Paul replied: "I would absolutely not run unless it were to win. ... We won't make a decision until 2014."

AP

Marco Rubio

In June 2013, Rubio told USA Today: "I know you're not going to believe me when I tell you this, I really don't think about that right now. Anytime you start thinking about what you're going to run for next, it begins to influence how you behave, the decisions you make, the issues you take on, the stances that you adopt."

Scott Walker

Scott Walker was asked about his presidential aspirations on an Aug. 28 appearance on "Fox & Friends," to which he responded: “At least on the Republican side, I think it’s too early. It’s a disservice to the party and the country."

Martin O'Malley

"Even if I knew, I don’t think it would change what I have to do this year, which is to govern well, always learn, become better prepared, and most important, deliver results for the people you’re serving,” Maryland Gov. Martin O'Malley said in response to a February BuzzFeed interview.

Kirsten Gillibrand

"I have no plans to run," Sen. Kirsten Gillibrand told reporters in May, citing only her support for a Hillary Clinton bid, but giving no plans in the event the former secretary of state doesn't run.

Bobby Jindal

"I got the best job in the world, and I’m going to be focused on being governor of this great state for the next three years," Louisiana Gov. Bobby Jindal told POLITICO last November, dodging a direct question about his 2016 plans.

Rick Santorum

“I haven’t made any decisions about 2016," Rick Santurom told reporters in a return visit to the Hill last November. "But thank you for asking.”